[llvm-commits] [llvm] r47658 - in /llvm/trunk: lib/Target/X86/README-X86-64.txt lib/Target/X86/X86Instr64bit.td test/CodeGen/X86/x86-64-and-mask.ll

[Christopher Lamb]

My understanding is that doing the patterns this way, rather than  
with the AsmPrinter hack, will improve JIT code quality on x86-64, no?
--
Christopher Lamb

On Mar 9, 2008, at 10:37 PM, Chris Lattner wrote:

>
> On Mar 9, 2008, at 10:29 PM, Christopher Lamb wrote:
>
>>
>> On Mar 9, 2008, at 10:17 PM, Chris Lattner wrote:
>>
>>>
>>> On Mar 9, 2008, at 9:28 PM, Christopher Lamb wrote:
>>>
>>>> I've prepared a change locally that allows you to write the  
>>>> following:
>>>>
>>>> // r & (2^32-1)
>>>> def : Pat<(and GR64:$src, i64immFFFFFFFF),
>>>>           (INSERT_SUBREG x86_impl_val_zero,
>>>>             (MOV32rr (EXTRACT_SUBREG GR64:$src, x86_subreg_32bit)),
>>>>             x86_subreg_32bit)>;
>>>
>>> Woot, very nifty!  In td files, we generally use lower case for  
>>> nodes, should 'INSERT_SUBREG' -> 'insert_subreg'?
>>
>> insert_subreg, the SDNode has existed since the first subreg  
>> support went in. This is for selecting to an INSERT_SUBREG target  
>> instruction.
>>
> Oh right, makes sense.
>
> -Chris




-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20080309/4986f232/attachment.html>